CN113523554A - Welding method for welding heat pipe radiator fins based on scanning galvanometer laser - Google Patents
Welding method for welding heat pipe radiator fins based on scanning galvanometer laser Download PDFInfo
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- CN113523554A CN113523554A CN202110762164.8A CN202110762164A CN113523554A CN 113523554 A CN113523554 A CN 113523554A CN 202110762164 A CN202110762164 A CN 202110762164A CN 113523554 A CN113523554 A CN 113523554A
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- 238000003466 welding Methods 0.000 title claims abstract description 163
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000758 substrate Substances 0.000 claims abstract description 34
- 238000005422 blasting Methods 0.000 claims abstract description 32
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 230000003746 surface roughness Effects 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000005480 shot peening Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 13
- 230000008595 infiltration Effects 0.000 abstract description 4
- 238000001764 infiltration Methods 0.000 abstract description 4
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 19
- 229910000679 solder Inorganic materials 0.000 description 11
- 238000005476 soldering Methods 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 7
- 239000011148 porous material Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 230000001788 irregular Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
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- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a method for welding heat pipe radiator fins based on scanning galvanometer laser welding, which comprises the following steps: s1, shot blasting is carried out on the welding surface of an L-shaped fin to be welded; s2, performing spot welding pre-fixing on the L-shaped fins subjected to shot blasting and the heat pipe radiator heat conduction substrate; and S3, generating a welding path based on the welding surface of the L-shaped fins, setting a laser galvanometer scanning mode, adjusting the power of the blue laser, starting welding from one side of the welding surface of the L-shaped fins to the other side of the welding surface of the L-shaped fins, keeping the positions of the L-shaped fins fixed in the welding process, and moving the laser galvanometer along the movement path at a set speed to complete the welding of the current L-shaped fins. The invention provides a welding method for laser welding heat pipe radiator fins based on a scanning galvanometer, which can solve the problems of incomplete infiltration, large laser welding power of air holes and copper alloy and aluminum alloy fins, low absorption rate and the like when a heat conduction substrate and the fins of a heat pipe radiator are welded by reflow welding and high-frequency induction heating at present.
Description
Technical Field
The invention relates to the technical field of welding of heat pipe radiators, in particular to a welding method for welding fins of a heat pipe radiator by laser based on a scanning galvanometer.
Background
The operating temperature of a semiconductor integrated circuit is an important factor influencing the stability of the semiconductor integrated circuit, and as the integration degree of the semiconductor integrated circuit is continuously improved, the heat generation amount per unit area of the semiconductor integrated circuit is continuously increased, which puts higher requirements on the heat radiation performance of a radiator. The unique phase change heat exchange mode of the heat pipe radiator enables the heat pipe radiator to achieve lower thermal resistance and higher heat dissipation efficiency than a solid radiator, so that the heat pipe radiator is widely applied to a heat dissipation system of an integrated circuit.
At present, a commonly used heat pipe radiator structure in the market mainly comprises three parts, namely a heat pipe, a heat conducting substrate and a fin, wherein the fin can be directly connected with the heat pipe or indirectly connected with the heat pipe through the heat conducting substrate. The connection of the fins and the heat-conducting substrate is usually realized by reflow soldering, and the welding is realized by coating low-melting solder paste on the welding part of the fins and the heat-conducting substrate in advance, clamping by using a special clamp and then sending into a reflow soldering furnace for multi-step temperature rise. Because the wetting ability of the solder paste is limited, the wetting of the part to be soldered is difficult to be completely realized in large-area reflow soldering, so that the heat conduction contact area is lower than the theoretical contact area, and the heat dissipation efficiency is reduced.
In view of the above situation, there is a need in the art to provide a welding method capable of replacing solder paste to weld heat pipe radiator fins, so as to overcome the shortcomings of the current welding process of heat pipe radiator fins and heat conducting substrates.
Disclosure of Invention
The invention mainly aims to provide a welding method for laser welding heat pipe radiator fins based on a scanning galvanometer, and aims to solve the problems of incomplete infiltration, large air holes, copper alloy and aluminum alloy fin laser welding power, low absorption rate and the like when a heat conduction substrate and fins of a heat pipe radiator are welded by reflow welding and high-frequency induction heating at present.
In order to achieve the purpose, the invention provides a welding method for laser welding of heat pipe radiator fins based on a scanning galvanometer, which is characterized by comprising the following steps of:
s1, shot blasting is carried out on the welding surface of an L-shaped fin to be welded;
s2, performing spot welding pre-fixing on the L-shaped fins subjected to shot blasting and the heat pipe radiator heat conduction substrate;
and S3, generating a welding path based on the welding surface of the L-shaped fins, setting a laser galvanometer scanning mode, adjusting the power of the blue laser, starting welding from one side of the welding surface of the L-shaped fins to the other side of the welding surface of the L-shaped fins, keeping the positions of the L-shaped fins fixed in the welding process, and moving the laser galvanometer along the movement path at a set speed to complete the welding of the current L-shaped fins.
Preferably, step S2 is specifically as follows: and placing the L-shaped fins subjected to shot blasting treatment in the to-be-welded area of the heat conduction substrate of the heat pipe radiator, adjusting the power of the blue laser, and performing laser spot welding pre-fixing on the initial end and the tail end of the welding surface of the L-shaped fins.
Preferably, the laser spot diameter is 40 μm to 60 μm, the laser power is 150W to 250W, and the laser wavelength is 430nm to 450nm in step S2.
Preferably, in step S2, the spot welding time is 1S-3S, the shielding gas is Ar gas, and the shielding gas flow is 14L/min-16L/min.
Preferably, the L-shaped fins and the heat conducting substrate are made of copper or copper alloy, and the thicknesses of the L-shaped fins and the heat conducting substrate are 0.2mm-0.4 mm.
Preferably, in the shot blasting in step S1, irregular shaped ceramic shot, cast steel shot or cast steel shot with a grain size of 0.05mm to 0.1mm is used, the shot blasting pressure is 0.1MPa to 0.2MPa, and the shot blasting coverage is 100% or more.
Preferably, the L-shaped fin surface roughness is between Ra10-Ra20 after the shot peening.
Preferably, the laser galvanometer scanning mode in step S3 is circular or infinite.
Preferably, the set speed of the laser galvanometer in the step S3 is 5m/min-6 m/min.
Preferably, the diameter of the laser spot beam in step S3 is 40 μm-60 μm, the laser power is 400W-600W, the laser wavelength is 430 nm-450 nm, the scanning frequency is 20Hz-40 Hz, the shielding gas is Ar gas, and the shielding gas flow is 16L/min-20L/min.
The welding method for the heat pipe radiator fin based on the scanning galvanometer laser welding has the following beneficial effects:
1. the laser generated by the selected blue laser has the absorption rate of copper and alloy thereof which is obviously higher than that of infrared laser, and meanwhile, the surface roughness of the welding surface of the fin of the copper and alloy thereof is improved by utilizing shot blasting treatment, the diffuse reflection of the laser on the welding surface is increased, the absorption rate of the fin to the laser is further improved, the fin can be welded under lower power, the heat input to the fin is reduced, and the welding seam deformation is reduced;
2. the laser galvanometer is used for scanning welding, and the circular or infinite scanning laser can stabilize a keyhole formed in the welding process, enable a molten pool to generate oscillation, prolong the escape time of air holes in the molten pool and reduce the porosity of a welding seam;
3. according to the scanning galvanometer laser welding process, when the fins and the heat-conducting substrate are welded, solder paste does not need to be coated on the welding surface, the defects of insufficient infiltration, air holes and the like easily caused in the conventional reflow soldering are avoided, and meanwhile, compared with the solder paste connection, the direct connection of the fins and the heat-conducting substrate has a higher average heat conductivity coefficient, namely, better heat dissipation performance.
Drawings
FIG. 1 is a schematic diagram of a welding method for laser welding heat pipe radiator fins based on a scanning galvanometer according to the invention;
FIG. 2 is a diagram illustrating a welding path of a laser galvanometer scanned in a circular manner according to the welding method for laser welding heat pipe radiator fins based on the scanning galvanometer;
FIG. 3 is a diagram illustrating a welding path of a heat pipe radiator fin scanned in an infinite manner by a laser galvanometer in the welding method of laser welding the heat pipe radiator fin based on the scanning galvanometer according to the present invention;
FIG. 4 is a schematic structural diagram of a heat pipe radiator in a first embodiment of a welding method for laser welding fins of the heat pipe radiator based on a scanning galvanometer according to the present invention;
fig. 5 is a schematic structural view of a heat pipe radiator in a second embodiment of the welding method for laser welding fins of the heat pipe radiator based on the scanning galvanometer of the present invention.
In the figure, 1-a laser galvanometer, 11-an optical fiber, 2-L-shaped fins, 21-welding surfaces of the L-shaped fins, 3-a heat conducting substrate and 4-a working platform.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, a welding method for laser welding heat pipe radiator fins based on a scanning galvanometer comprises the following steps:
s1, shot blasting is carried out on a welding surface 21 of an L-shaped fin 2 to be welded so as to obtain proper surface roughness;
s2, performing spot welding pre-fixing on the L-shaped fins 2 subjected to shot blasting and the heat pipe radiator heat conduction substrate 3;
s3, generating a welding path based on the welding surface 21 of the L-shaped fin 2, setting a galvanometer scanning mode, adjusting the power of the blue laser, starting welding from one side of the welding surface 21 of the L-shaped fin 2 to the other side of the welding surface, finishing welding (namely welding along the length direction of the L-shaped fin 2), keeping the position of the L-shaped fin 2 fixed in the welding process (fixing the heat-conducting substrate 3 through the working platform 4 to keep the position of the L-shaped fin 2 fixed), and moving the laser galvanometer 1 along the movement path at a set speed to complete the welding of the current L-shaped fin 2;
and S4, repeating the steps S2 and S3 until the welding of all the L-shaped fins 2 is completed.
Step S2 is specifically as follows: and placing the L-shaped fins 2 subjected to shot blasting treatment in the areas to be welded of the heat pipe radiator heat-conducting substrate 3, adjusting the power of a blue laser, and performing laser spot welding pre-fixing on the initial ends and the tail ends of the welding surfaces 21 of the L-shaped fins 2.
In the step S2, the diameter of the laser spot is 40-60 μm, the laser power is 150-250W, and the laser wavelength is 430-450 nm.
And step S2, the spot welding time is 1S-3S, the shielding gas is Ar gas, and the shielding gas flow is 14L/min-16L/min. The L-shaped fins 2 and the heat conducting substrate 3 are made of copper or copper alloy, and the thicknesses of the L-shaped fins 2 and the heat conducting substrate 3 are both 0.2mm-0.4 mm.
When the shot blasting is performed in the step S1, irregular ceramic shot, cast steel shot or cast steel shot (cast steel shot or cast steel shot with an irregular shape of 0.05mm-0.1mm in average grain diameter) with the grain diameter of 0.05mm-0.1mm is adopted, the shot blasting pressure is 0.1MPa-0.2MPa, and the shot blasting coverage rate is more than or equal to 100%. After the shot blasting, the surface roughness of the L-shaped fin 2 is between Ra10 and Ra 20.
In step S3, the set speed of the laser galvanometer is 5m/min-6 m/min.
Referring to fig. 2 and 3, the scanning mode of the laser galvanometer 1 in step S3 is circular or infinite. Fig. 2 shows a welding path in which the scanning mode of the laser galvanometer 1 is circular. Fig. 3 shows a welding path where the scanning mode of the laser galvanometer 1 is infinite.
In the step S3, the diameter of the laser spot beam is 40-60 μm, the laser power is 400-600W, the laser wavelength is 430-450 nm, the scanning frequency is 20-40 Hz, the protective gas is Ar gas, and the flow rate of the protective gas is 16-20L/min.
At present, a heat conducting substrate 3 and an L-shaped fin 2 of a heat pipe radiator are connected through solder paste reflow soldering. In solder paste reflow soldering, after solder paste is liquefied after reaching a melting point, a soldering area is infiltrated by clamping pressure and capillary action, the infiltrating capacity of the solder paste is limited, an un-infiltrated area can be generated inevitably, gas existing in the soldering area in the pre-clamping process cannot be completely removed, and air holes are left. Aiming at the problems, the invention provides a method for welding the heat pipe radiator fins and the heat conducting substrate 3 by adopting a scanning galvanometer laser process, improves the laser absorption rate of the fins by adopting a shot blasting pretreatment method before welding, and realizes the high-quality welding of the fins by adopting galvanometer laser with specific wavelength and a specific scanning mode.
Under a certain temperature, the intrinsic absorption rate of the metal material to the laser with a specific wavelength is constant, for example, the intrinsic absorption rate of copper and copper alloy to the laser with a long wave band is lower than 10%, and the intrinsic absorption rate to the laser with a short wave band can reach 50%, so that the blue laser is used as a welding heat source. In addition, since the surface of the material is not absolutely smooth, the laser light may have a certain diffuse reflection on the surface of the material, so that the actual absorption rate of the laser light is higher than the inherent absorption rate. Therefore, the roughness of the welding surface is increased through shot blasting treatment before welding, and through specific limitation on the shape and size of shot blasting, the included angle of the wave trough of the finally obtained surface contour line of the fin is made to be as small as possible so as to increase the reflection times of laser, thereby improving the actual absorption rate of the fin to the laser, reducing the laser power during welding and reducing energy consumption and deformation.
As a key design point of the invention, scanning laser is an important method for stabilizing a welding pool and avoiding pore defects. When copper and its alloys are laser welded, small-hole type pores and hydrogen pores are easily generated. The small hole type air hole is caused by the fact that protective gas is drawn into the laser keyhole by vortex formed when metal steam in the laser keyhole escapes outwards, and circular or infinite scanning laser adopted by the invention can expand and stabilize the keyhole so that gas in the keyhole can escape in time. Meanwhile, upward vortex can be formed inside the circular or infinite scanning laser molten pool, so that the escape of hydrogen pores is promoted, and the circular or infinite scanning laser molten pool and the hydrogen pores act together to ensure that a welding seam is basically free of pore defects.
The present invention will be described in detail with reference to two specific examples.
Example one
As shown in fig. 4, the heat conducting substrate 3 of the heat pipe radiator has a length of 120mm, a width of 90mm and a thickness of 4 mm; the welding surface 21 of the L-shaped fins 2 is 4mm wide, and 30L-shaped fins 2 are required to be welded on the heat conducting substrate 3.
When the welding method is utilized, the method specifically comprises the following steps:
the first step is as follows: carrying out shot blasting on the welding surface 21 of the L-shaped fin 2 to be welded, wherein irregular ceramic shots with the grain diameter of 0.05mm are adopted, the shot blasting pressure is 0.1MPa, and the obtained surface roughness of the fin is Ra10-Ra 20;
the second step is that: placing the L-shaped fins 2 subjected to shot blasting treatment in the to-be-welded area of the heat-conducting substrate 3 of the heat pipe radiator, adjusting the power of a blue laser to 200W, adjusting the diameter of a laser spot beam to 50 mu m, adjusting the laser wavelength to 450nm, and performing laser spot welding pre-fixing at the beginning and the tail end of the welding surface 21 of the L-shaped fins 2;
the third step: generating a welding path based on a welding surface 21 of the L-shaped fin 2, installing the laser galvanometer 1 on a welding robot arm, setting the scanning mode of scanning the laser galvanometer 1 to be circular scanning, wherein the diameter of a laser spot beam is 50 microns, the scanning frequency is 30 Hz, the amplitude is 1.5mm, the laser power is 500W, the laser wavelength is 450nm, the welding speed is 6m/min, the protective gas is 99.99% Ar, and the flow of the protective gas is 18L/min. Starting welding from the initial end of the welding surface 21 of the L-shaped fin 2 and ending welding to the tail end, wherein the position of the L-shaped fin 2 is kept fixed in the welding process, and the laser galvanometer 1 moves along a movement path at a set speed;
the fourth step: and repeating the third step until all the L-shaped fins 2 are welded.
Example two
As shown in fig. 5, the heat pipe radiator heat conducting substrate 3 has a length of 90mm, a width of 100mm and a thickness of 4 mm; the welding surface 21 of the L-shaped fins 2 is 4mm wide, and 30L-shaped fins 2 are required to be welded on the heat conducting substrate 3.
When the welding method is utilized, the method specifically comprises the following steps:
the first step is as follows: carrying out shot blasting on the welding surface 21 of the L-shaped fin 2 to be welded, adopting irregular cast steel shot with the grain diameter of 0.1mm, wherein the shot blasting pressure is 0.15MPa, and the obtained surface roughness of the fin is Ra10-Ra 20;
the second step is that: placing the L-shaped fins 2 subjected to shot blasting treatment in the to-be-welded area of the heat-conducting substrate 3 of the heat pipe radiator, adjusting the power of a blue laser to 150W, adjusting the diameter of a laser spot beam to 40 mu m, adjusting the laser wavelength to 430nm, and performing laser spot welding pre-fixing on the initial end and the tail end of a welding surface 21 of the L-shaped fins 2;
the third step: generating a welding path based on a welding surface 21 of the L-shaped fin 2, installing the scanning laser galvanometer 1 on a welding robot arm, setting the scanning mode of the laser galvanometer 1 to be infinite scanning, setting the diameter of a laser spot beam to be 40 mu m, the scanning frequency to be 40Hz, the amplitude to be 1.2mm, the laser power to be 400W, the laser wavelength to be 430nm, the welding speed to be 5m/min, the protective gas to be 99.99% Ar and the flow of the protective gas to be 20L/min. Starting welding from the initial end of the welding surface 21 of the L-shaped fin 2 and ending welding to the tail end, wherein the position of the L-shaped fin 2 is kept fixed in the welding process, and the laser galvanometer 1 moves along a movement path at a set speed;
the fourth step: and repeating the third step until all the L-shaped fins 2 are welded.
The welding method for the heat pipe radiator fin based on the scanning galvanometer laser welding has the following beneficial effects:
1. the laser generated by the selected blue laser has the absorption rate of copper and alloy thereof which is obviously higher than that of infrared laser, and meanwhile, the surface roughness of the welding surface of the fin of the copper and alloy thereof is improved by utilizing shot blasting treatment, the diffuse reflection of the laser on the welding surface is increased, the absorption rate of the fin to the laser is further improved, the fin can be welded under lower power, the heat input to the fin is reduced, and the welding seam deformation is reduced;
2. the laser galvanometer 1 is used for scanning welding, circular or infinite scanning laser can stabilize a keyhole formed in the welding process, a molten pool is oscillated, the escape time of air holes in the molten pool is prolonged, and the porosity of a welding seam is reduced;
3. according to the scanning galvanometer laser welding process, when the fins and the heat conducting substrate 3 are welded, solder paste does not need to be coated on the welding surface, the defects of insufficient infiltration, air holes and the like easily caused in the conventional reflow soldering are avoided, and meanwhile, the fins and the heat conducting substrate 3 are directly connected and have higher average heat conductivity coefficient compared with the solder paste connection, namely, the heat radiating performance is better.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are intended to be covered by the scope of the present invention.
Claims (10)
1. A welding method for laser welding of heat pipe radiator fins based on a scanning galvanometer is characterized by comprising the following steps:
s1, shot blasting is carried out on the welding surface of an L-shaped fin to be welded;
s2, performing spot welding pre-fixing on the L-shaped fins subjected to shot blasting and the heat pipe radiator heat conduction substrate;
and S3, generating a welding path based on the welding surface of the L-shaped fins, setting a laser galvanometer scanning mode, adjusting the power of the blue laser, starting welding from one side of the welding surface of the L-shaped fins to the other side of the welding surface of the L-shaped fins, keeping the positions of the L-shaped fins fixed in the welding process, and moving the laser galvanometer along the movement path at a set speed to complete the welding of the current L-shaped fins.
2. The welding method for the heat pipe radiator fins based on the scanning galvanometer laser welding as claimed in claim 1, wherein the step S2 is as follows: and placing the L-shaped fins subjected to shot blasting treatment in the to-be-welded area of the heat conduction substrate of the heat pipe radiator, adjusting the power of the blue laser, and performing laser spot welding pre-fixing on the initial end and the tail end of the welding surface of the L-shaped fins.
3. The welding method of heat pipe radiator fins based on scanning galvanometer laser welding as claimed in claim 2, wherein in step S2 the laser spot beam diameter is 40 μm-60 μm, the laser power is 150W-250W, and the laser wavelength is 430 nm-450 nm.
4. The welding method of the heat pipe radiator fin based on the scanning galvanometer laser welding as set forth in claim 2, wherein the spot welding time is 1S-3S in step S2, the shielding gas is Ar gas, and the shielding gas flow is 14L/min-16L/min.
5. The welding method of the scanning galvanometer-based laser welding heat pipe radiator fins as claimed in claim 1, wherein the materials of the L-shaped fins and the heat conducting substrate are copper or copper alloy, and the thicknesses of the L-shaped fins and the heat conducting substrate are both 0.2mm-0.4 mm.
6. A method for welding heat pipe radiator fins based on scanning galvanometer laser welding as claimed in claim 1, wherein the shot blasting in step S1 is performed by using irregularly shaped ceramic, cast steel or cast steel shots with a particle size of 0.05mm to 0.1mm, the shot blasting pressure is 0.1MPa to 0.2MPa, and the shot blasting coverage is 100% or more.
7. A method of claim 1 for welding heat pipe heat sink fins based on scanning galvanometer laser welding, wherein after the shot peening, the L-shaped fin surface roughness is between Ra10-Ra 20.
8. The welding method of heat pipe radiator fins based on scanning galvanometer laser welding of claim 1, wherein the scanning mode of the laser galvanometer in step S3 is circular or infinite.
9. The welding method of heat pipe radiator fins based on scanning galvanometer laser welding of claim 1, wherein the set speed of the laser galvanometer in step S3 is 5m/min-6 m/min.
10. The welding method of the scanning galvanometer-based laser welding heat pipe radiator fins according to any one of claims 1 to 9, wherein in step S3, the laser spot beam diameter is 40 μm to 60 μm, the laser power is 400W to 600W, the laser wavelength is 430nm to 450nm, the scanning frequency is 20Hz to 40Hz, the shielding gas is Ar gas, and the shielding gas flow is 16L/min to 20L/min.
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| CN202110762164.8A CN113523554A (en) | 2021-07-06 | 2021-07-06 | Welding method for welding heat pipe radiator fins based on scanning galvanometer laser |
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| CN202110762164.8A CN113523554A (en) | 2021-07-06 | 2021-07-06 | Welding method for welding heat pipe radiator fins based on scanning galvanometer laser |
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| CN202110762164.8A Pending CN113523554A (en) | 2021-07-06 | 2021-07-06 | Welding method for welding heat pipe radiator fins based on scanning galvanometer laser |
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